Revolving twin chairs.



No. 720,692. 'PATENTBD 12m17.190s.

G. c. HAWKINS.

RBVOLVING TWIN CHAIRS.

APPLIATION FILED IAN. 31; 1902.

N0 MODEL.

TH: mams PETERS co.. PHUmLlTHO.. wAsnlNnoN, uA al UNITED STATES PATENTOFFICE.

GARDNER O. IIAWKl-NS, OF BOSTON, MASSACHUSETTS.

REVOLVlNG TWIN CHAIRS.

SPECIFICATION forming part of Letters Patent No. 720,692, dated February17, 1903.

Application filed January 31,' 1902. Serial No. 91,972. (No model.) v

T all whom/ t may concern:

Be it known that I, GARDNER C.'HAwK1Ns, a citizen of the United States,and a resident of Boston, county of Suffolk, State of Massachusetts,have invented an Improvement in a pair of twin revolving chairsconstructed in accordance with my invention. Fig. 2 is a plan viewthereof with the seats removed, and Figs. 3 and 4 are details of thelocking means.

In the ordinary form of revolving twin chairs a suitable base orstandard is provided on which the seats are mounted to revolve aboutvertical axes, and suitable connectingm mechanism is employed, so as tocause the seats to revolve in unison. Heretofore the locking means formaintaining the seats in their adjusted position has been applieddirectly to the seats themselves; and it is one of the objects ofv myinvention to devise a novel form of locking mechanism which instead oflooking the seat directly locks instead the connecting member betweenthe seats.

3 designates any suitable base or standard, having arms 4 projectingtherefrom, at the ends of which are journaled vertical spindles 6,carrying at their upper ends spiders 7, on

which the two chair or seat bodies 5 are sup# ported. Each spindle 6 hasfast thereon a gear 9, and in order that the two spindles, andconsequently the chairs, may rotate in unison I have provided aconnecting member 10, centrally -pivoted to the standard 3 and havingits ends shaped to form segmental racks 11, which mesh with the gears 9.From this construction it will be obvious that when either chair or seat5 is turned about its spindle the other chair will be correspondinglyturned and to a corresponding extent. The rack portions 11 of theconnecting member are ofa length sufficient to allow each seat to makeIn order to prevent the turning of the seats when they are swung intotheir adjusted position, I provide a novel locking device, whichVcooperates with the connecting member 10.

Referring to Fig. 3, which is a section through the end of theconnecting member l0 and the arm 4 on substantially the line 0c, Fig. 2,it will be seen that the under side of the rack portion 11 is providedwith two locking-recesses 15 and that the arm 4. is provided with asuitable recess 16, which receives a spring-pressed pin 17, carrying atits upper end a roll 18, which is adapted to be received by eitherrecess 15, according to the position of the connecting member 10. Thepin 17 is illustrated as having a collar 22 thereon, against which oneend of the spring 21 abuts, the other end of the spring resting on thebottom of the recess, the said spring thus operating to force the pinupwardlyagainst the rackportion 11.

It is oneof the purposes of my present invention to provide a lockingdevice which requires no special manual manipulation to release thesame, and accordingly I have provided theupper end of the pin with aroll 18 and made the recesses 15 with rounding edges, as at 20. Withthis construction it will be obvious that if either seat is turned aboutits pivot the connecting member will be given a v other recess 15 comesinto position over the locking-pin 17, and the spring 21 thereuponforces the said spring upwardly, carrying the roll into the recess, andthus locking the connecting member 10.

I have found from experiment that the form IOO of locking mechanismherein shown is suiicient to prevent the rotation of the chairs whilebeing used, and yet is of such a character that no special manipulationof the locking device is necessary to release the same. The operation,therefore, of reversing the position of lthe chairs or seats is reducedto a minimum, as it is simply necessary with my invention to turn eitherchair with sufficient force to force the locking-pin out of the recesswhich it occupies. l

I may employ the locking means herein shown at one or both ends of thelocking member, as desired.

While I have shown one form in which my invention may be embodied, yetmy inven tion is not limited to the exact construction shown herein, asvarious changes may be made in the details of the construction with outdeparting from the invention expressed in the appended claims.

Having fully described my invention, what I claim as new, and desire tosecure by Letters Patent, is-

l. Revolving twin chairs comprising in their construction a base orstandard, two seats mounted to rotate about fixed axes on said standard,means connecting said seats whereby they rotate in unison, a lockingdevice for said connectingl means, and means independent from thelocking device to limit the turning movement of the seats.

2. A base or standard, two seats mounted to rotate thereon, a gear rigidwith each seat, a pivoted connecting member having gearteeth at each endmeshing with the gears on the chairs, and a locking device for saidconnecting member.

3. A base or standard, two seats mounted on spindles journaled in saidbase or standard, a gear fast on each spindle, a connecting memberpivoted to the standard and having at each end gear-teeth meshing withthe said gears, said connecting member having a plurality oflockingrecesses,and a spring-pressed stop carried by the stand andadapted to be engaged by one or the other of said recesses.

4. A base or standard, two seats mounted on spindles journaled in saidbase or standard, a gear fast on each spindle, a connecting memberpivoted to the standard and having at each en d gear-teeth meshing withthe said gears, said connecting member having a plurality oflockingrecesses,and a spring-pressed stop carried by the standard andhaving at its upper end a roll adapted to enter either one of saidrecesses.

5. Revolving twin chairs comprising in their construction a base orstandard, two seats mounted to rotate in unison about said standard, andconnections between said seats whereby they rotate in unison, saidconnections carrying means to limit the turning movement of these seats.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

GARDNER C. IIAVVKINS.

Vitnesses:

JOHN C. EDWARDS, Louis C. SMITH.

